Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Em que ano a construção começou em Heysham 1.
 ###Tabelas: CREATE TABLE 20th-_and_21st-century_swiss_confederation_issues (20th-_and_21st-century_swiss_confederation_issues_id AUTO_INCREMENT PRIMARY KEY, Location VARCHAR, Date INT, Denomination VARCHAR, Coinage metal VARCHAR, Mintage INT, KM number VARCHAR) CREATE TABLE satellite_craters (satellite_craters_id AUTO_INCREMENT PRIMARY KEY, Gill VARCHAR, Latitude VARCHAR, Longitude VARCHAR, Diameter (km) VARCHAR, Diameter (mi) VARCHAR) CREATE TABLE top_ten_best-selling_albums_recorded_by_japanese_artists (top_ten_best-selling_albums_recorded_by_japanese_artists_id AUTO_INCREMENT PRIMARY KEY, Rank INT, Year INT, Title VARCHAR, Artist VARCHAR, Sales INT) CREATE TABLE rookie_list (rookie_list_id AUTO_INCREMENT PRIMARY KEY, Player VARCHAR, AFL debut VARCHAR, Games VARCHAR, Goals VARCHAR, Kicks VARCHAR, Handballs VARCHAR, Disposals VARCHAR, Marks VARCHAR, Tackles VARCHAR) CREATE TABLE current_agr_reactors (current_agr_reactors_id AUTO_INCREMENT PRIMARY KEY, AGR Power Station VARCHAR, Net MWe INT, Construction started INT, Connected to grid INT, Commercial operation INT, Accounting closure date INT)  
SELECT Construction started FROM current_agr_reactors WHERE AGR Power Station = Heysham 1